S-34C02A Datasheet, PDF (24/34 Pages) Seiko Instruments Inc – 2-WIRE CMOS SERIAL E2PROM FOR DIMM SERIAL PRESENCE DETECT

2-WIRE CMOS SERIAL E²PROM FOR DIMM SERIAL PRESENCE DETECT
S-34C02A
Rev.1.2_00
4. Acknowledge check
The I²C-bus protocol includes an acknowledge check function as a handshake function to prevent a communication
error. This function allows detection of a communication failure during data communication between the master device
and S-34C02A. This function is effective to prevent malfunction, so it is recommended to perform an acknowledge
check with the master device.
5. Built-in power-on-clear circuit
The S-34C02A has a built-in power-on-clear circuit that initializes itself at the same time during power-on.
Unsuccessful initialization may cause a malfunction. To operate the power-on-clear circuit normally, the following
conditions must be satisfied to raise the power supply voltage.
5. 1 Raising power supply voltage
Shown in Figure 24, raise the power supply voltage from 0.2 V max., within the time defined as t_RISE which is the
time required to reach the power supply voltage to be set.
For example, if the power supply voltage is 5.0 V, t_RISE = 200 ms seen in Figure 25. The power supply voltage must
be raised within 200 ms.
t_RISE (Max.)
Power Supply Voltage (V_CC)
V_INIT (Max.)
0.2 V
0 V^*1
t_INIT^*2 (Max.)
*1. 0 V means there is no difference in potential between the V_CC pin and the GND pin of the S-34C02A.
*2. t_INIT is the time required to initialize the S-34C02A. No instructions are accepted during this time.
Figure 24 Raising Power Supply Voltage
24
Seiko Instruments Inc.